KIT 1/4-20 - Heli Coil Products

The Heli-Coil 5721-4 KIT 1/4-20 is a professional-grade thread repair solution engineered to permanently restore stripped, worn, or damaged 1/4-20 UNC threads to their original factory specifications. This comprehensive kit provides technicians and mechanics with the essential components to create stronger, more reliable threaded connections in a wide range of materials, effectively extending the lifespan of critical components. It ensures a robust repair that is superior to the original tapped hole.

Key Features

• Durable Stainless Steel Inserts: Each kit includes precision-formed helical inserts crafted from 18-8 (Type 302/304) stainless steel wire, offering exceptional strength, wear resistance, and superior corrosion protection.
• Complete Repair System: Contains all necessary tools for a reliable thread repair, typically including a high-speed steel tap, and an installation tool, alongside 12 stainless steel inserts.
• Enhanced Thread Strength: Heli-Coil inserts distribute stress evenly across the threads, creating a repaired thread that often exceeds the strength of the original, eliminating potential for thread wear, seizing, and corrosion.
• Mirror-Smooth Surface Finish: The inserts feature an 8-16 micro-inch surface finish, which minimizes friction and ensures maximum clamping torque with less wrench effort, preventing galling.
• Broad Temperature Resistance: Capable of maintaining integrity in temperatures ranging from -320°F to +800°F, suitable for demanding automotive and industrial environments.

Applications

This Heli-Coil 1/4-20 thread repair kit is indispensable for professional technicians in automotive, industrial, and heavy equipment maintenance. It is widely used for repairing damaged threads in engine blocks, cylinder heads, transmission housings, oil drain plugs, exhaust and intake manifolds, and brake calipers. The system is effective across various materials including aluminum, magnesium, cast iron, bronze, and can even be utilized for thread reinforcement in softer metals or plastics, making it a versatile addition to any professional toolbox.